Wheel Bearing

Wheel bearings are not adjustable. To check wheel bearing for excessive wear, raise and support vehicle. Remove rear wheel.
On disc brake vehicles, fix brake disc with two wheel nuts. Compress caliper piston to free disc. Mount dial indicator to axle hub. Grasp brake disc and apply force in and out. If measurement exceeds .002" (.05 mm), replace bearing.
On drum brake vehicles, remove brake drum. With dial indicator stem mounted against center (outboard side) of axle hub, measure end play. See Fig 2 . If end play is more than .002" (.05 mm), replace axle bearing.

Fig 1: Exploded View of Rear Suspension (Typical)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Mounting Dial Indicator (LSi Shown; GSi Similar

Courtesy of GENERAL MOTORS CORP.